I don't get easily scared by scary movies, but due to knowing nothing about it and being most scared by scientific/space-related things (as opposed to ghosts/demons/possession), I came out realizing I watched one of the scariest movies i've ever seen.
I've seen much worse in terms of gore/blood, but the context in which the gore was presented was a mind-fuck. Am I the only one who feels this way?
edit: I mean, hell, even the title of the movie gives it a "cool sci-fi movie" vibe; it doesn't exactly scream "horror movie"